Cats and dogs. Alligators and bunnies. Tigers and just about anything. These are generally examples of species that don't play well together. But all over the world animals have been caught on video and in photos making friends with their natural-born enemies, and social media's helpng such unlikely incidents become a little more believable. One look at these playmates having fun together will make you believe that maybe we could all do more to make friends with folks who are a little bit different from ourselves.